The polluting energy sources are more expensive. How fucking lucky is that!
But I don't think nuclear deregulation will motivate the rapid change we require to avoid climate disaster. Carbon tax would help, I think, but there is zero chance it will be implemented on the global scale. (Fuck our lives, right?)
There is a serious chance you can power most of the global population by building reactors and putting them on ships. Most people live on the coast.
The most scary place is actually Indonesia, they literally have 100s of coal plants in development. Gigantic population and nothing other then coal. Thankfully the government there is actually aware of the problem and they are working with a nuclear reactor company called Thorcon.
https://thorconpower.com/project/
This is a bit fishy because Indonesia doesn't actually have a regulator that is internationally accepted, but they are trying to build that at the same time. I am skeptical but its a great effort.
In Canada you have Terrestrial Energy and Moltex Energy doing amazing things. Terrestrial Energy is furthest along.
In the US you Kairos Power that seems active, and thankfully the regulator is starting to open up.